Quantification of sedimentary oxygen and carbon dioxide dynamics in a dry sandy beach affected by macroalgae deposition

受大型藻类沉积影响的干燥沙滩中沉积氧和二氧化碳动态的量化

基本信息

批准号：
2049177
负责人：
Markus Huettel
金额：
$ 13.99万
依托单位：
Florida State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-07-01 至 2024-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2049177&HistoricalAwards=false
关键词：
Quantification sedimentary oxygen carbon dioxide

项目摘要

Sandy beaches provide habitat for endangered species, protect the coast, and are appreciated for their high social and economic values. They are facing escalating anthropogenic pressures through coastal development, nutrient increases and global warming, which in recent years led to the development of extensive seaweed blooms that deposit massive amounts of algae on sandy beaches worldwide. This project investigates the fate of the deposited algae and their influence on the biogeochemical environment of the beach.The decay of the algae locally depletes oxygen in the beach and produces toxic sulfides and high concentrations of ammonia that harm beach organisms, pollute nearshore waters and deter tourists. Research in this project quantifies biogeochemical and transport processes that control the algal decomposition. Generating these data is prerequisite for developing models that can predict the impact of the massive macroalgal deposition and thereby support decision making and coastal management. The project research is tightly linked to an educational component with instruction of graduate and undergraduate students in marine biogeochemical methods, and a dedicated outreach program informing the public about the seaweed issue and pathways to reduce this problem.The project produces data on the dynamics of oxygen and carbon dioxide distribution and interfacial gas flux in the dry, supralittoral zone (between high tide line and dunes) of sandy beaches and determines how distributions and fluxes are influenced by the degradation of the macroalgae. Organic carbon and nitrogen profiling characterizes the biogeochemical sedimentary environment at the two study sites, a carbonate and a silicate beach. A set of laboratory experiments relates gas fluxes to the degradation rate of buried macroalgal layers and the effects of gas exchange, temperature and moisture. The data will allow estimates of the time frame of the algal decomposition process and provide information on the degradation capacity of sandy beaches. Since beach sedimentary O2 and CO2 dynamics and fluxes are largely undescribed, the project data contribute to the mechanistic and quantitative understanding of carbon and nutrient cycling in sandy beaches.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

沙滩为濒临灭绝的物种提供栖息地，保护海岸，并因其较高的社会和经济价值而受到赞赏。由于沿海开发、营养增加和全球变暖，它们面临着不断升级的人为压力，近年来，全球变暖导致海藻大量繁殖，在世界各地的沙滩上沉积了大量藻类。该项目调查沉积藻类的命运及其对海滩生物地球化学环境的影响。藻类的腐烂会消耗海滩中的局部氧气，并产生有毒的硫化物和高浓度的氨，危害海滩生物，污染近岸水域并阻止游客。该项目的研究量化了控制藻类分解的生物地球化学和运输过程。生成这些数据是开发模型的先决条件，该模型可以预测大规模大型藻类沉积的影响，从而支持决策和沿海管理。该项目研究与教育部分紧密相关，包括对研究生和本科生进行海洋生物地球化学方法的指导，以及专门的外展计划，向公众宣传海藻问题和减少该问题的途径。该项目产生有关氧气动力学的数据以及沙滩干燥的滨海地带（高潮线和沙丘之间）的二氧化碳分布和界面气体通量，并确定大型藻类退化如何影响分布和通量。有机碳和氮剖面表征了两个研究地点（碳酸盐海滩和硅酸盐海滩）的生物地球化学沉积环境。一组实验室实验将气体通量与埋藏的大型藻层的降解率以及气体交换、温度和湿度的影响联系起来。这些数据将有助于估计藻类分解过程的时间范围，并提供有关沙滩降解能力的信息。由于海滩沉积物 O2 和 CO2 动态和通量在很大程度上未被描述，因此该项目数据有助于对沙滩中碳和养分循环的机制和定量理解。该奖项反映了 NSF 的法定使命，并通过使用基金会的评估进行评估，被认为值得支持。智力价值和更广泛的影响审查标准。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Drifter and dye tracks reveal dispersal processes that can affect phytoplankton distributions in shallow estuarine environments

漂流物和染料轨迹揭示了可能影响浅河口环境中浮游植物分布的扩散过程

DOI：
10.1016/j.ecss.2022.107811
发表时间：
2022
期刊：
Coastal and Shelf Science
影响因子：
0
作者：
Geyer, Natalie L.;Balwada, Dhruv;Simons, Elizabeth;Speer, Kevin;Huettel, Markus
通讯作者：
Huettel, Markus

Aquatic Eddy Covariance: The Method and Its Contributions to Defining Oxygen and Carbon Fluxes in Marine Environments